Production of fast-colored prints.



find ens .ltlil l' on.

HERBERT LEVINSTEIN, OF BLACKI'JEY, MANCHESTER, ENGLAND, ASSIGNOR TOCOMPANY OF LEVINSTEIN LIMITED, OF MANCHESTER, ENGLAND.

YRODUCTION 0F FAST-COLORED PRINTS.

N0 Drawing.

To all whom it may concern Be it known that I, HERBERT LEVINSTEIN, asubject of the King of Great Britain and Ireland, and a resident ofBlackley, Manchester, in the county of Lancaster, England, have inventednew and useful Improvements in the Production of -Fast-Colored Prints,of which the following is a specification.

This invention relates to a printing paste and its utilization in theproduction upon will liberate formaldehyde when vegetable fibers of fastprinted shades. The printing paste contains formaldehyde or a substancecapable of liberating formaldehyde when heated, a non-substantivedyestuif which will form an insoluble compound when heated withformaldehyde, and any desired suitable thickening agent. The paste isprinted upon the fabric and is then steamed. The heat of steaming causesthe formaldehyde to become active and render the dyestulf insoluble.

Among the dyestuffs which are particularly applicable for use accordingto this invention are those containing as an end component resorcin orhomologues or substitution products of resorcin, but the invention isnot limited to the use of such dyestuffs.

The following are examples of how-nonsubstantive dyestuffs maybeproduced and utilized according to this invention in a printing pastecontaining a substance which it is steamed.

Example 1: 239 parts of 2.5-aminonaph thol-7-sulfonic acid are dissolvedwith 60 parts of sodium carbonate tor which are added 350 parts ofhydrochloric acid (27% HCl). and then 69 parts of sodium nitrite. Thediazo body so obtained is mixed with 110 parts of resorcin. 250 parts ofsoda are now added. Combination takes place very quickly and the newdyestufi' is isolated in the usual way by means of salt. The paste soobtained can be directly used in the composition of a printing paste orit may be dried. A printing paste may be prepared by mixing together 20parts of the above paste, 16 parts of hexamethylenetetramin solution ofa strength obtained by mixing commercial 40% formaldehyde with therequisite amount of commercial 25% ammonia (the solution should beneutral to brilliant Specification of Letters Patent.

Application filed February 7, 1914:.

Patented Oct. 26, T915.

Serial No. 817,165.

yellow paper), and 200 parts of starch paste Cotton goods are printedwith the paste so prepared, and, after drying, are steamed in the usualway. The heat of steaming liberates formaldehyde from thehexamethylene'tetramin and causes the thus liberated formaldehyde to actupon the dyestufi and render it insoluble. A fast'brown is obtainedwhich is quite unaflected by boiling with soap.

Example 2: 143 parts of beta-naphthylamin are diazotized by means of 69parts of sodium nitrite and the necessary quantity of hydrochloric acid.The diazo compound so produced is poured into a solution of 144.5 partsof mono-chlor-resorcin containing a suflicient quantity of soda to keepthe solution alkaline. The resulting dyestuff is isolated by saltingout. A printing paste is prepared by mixing together as in the precedingexample and the goods are printed and treated as already described. Abrown shade is produced.

If desired formaldehyde itself may be used instead ofhexamethylenetetramin in the production of the printing paste, or anyother substance capable of liberating forv maldehyde on steaming may beemployed.

The following table gives the constitution of other dyestuffs which maybe utilized according to this invention and the shades pro duced by themafter fixing with formaldehyde:

Amlnoacetanilid+resorcin Orange. gnilln+resorcin Yellow orange.Orthoanisidin+resorcin... Reddish orange. Paroxylidin+resorcin 0 Orange.

.p-Amiuopheno1+resorcin.

Orthoammophenol-i-resorcin .Red-brown. Alpha-naphthylamin+res0rcin.Brown. Naphthionic acid+tesorcin .Red brown. 1.2-Aminonaphtholether+resorcln .Brown.

2-Amino-8-naphtho1-6-sulfonic acid+resorcin. Brown.2-Amino-5-naphthol-7-sulfonic acid+ph1oroglucin.Brown.

Q-Amino-5-naphthoI-7-su1fonic aeid+naphthoresorcin Brown.p-Aminoacetanilid+orcinol Orange.

-Aminoacetanilid+m-aminophen0l Orange brown. eternaphthy1amin+resorcincarboxylic acid (1.2.4) .Brownto act upon the dyestufi and render itinsoluble, substantially as set forth.

2. The production of fast shades upon vegetable fabric by printing thefabric with a paste containing a substance which will 10 upon the fabricto liberate formaldehyde and cause such liberated formaldehyde to actupon the dyestufi" and render it insoluble, substantially as set forth.

In witness whereof I have hereunto set my hand in the presence of twosubscribing 15 witnesses.

HERBERT LEVINSTEIN. WVitnesses:

VVALTER V. BALL, F. H000.

